function s1_hello(){
echo "hello, world!"
}
function s2_tell_who_i_am(){
	echo $(whoami)
}
function s3_which_distro_do_i_use(){
grep ^NAME= /etc/os-release
}
function s4_view_my_cpu_arch(){
uname -m
}
function s5_show_first_scsi_disk_size(){
lsblk -l |grep -m1 'sd' | awk '{print $4}'  |sed 's/[[:alpha:]]//g'
}
function s6_show_main_memory_size_in_megabytes(){
 free -m  |grep "Mem:"  |awk '{print $2}'
}
